view src/video/xbios/SDL_xbios_blowup.h @ 1542:a8bf1aa21020

Fixed bug #15 SDL_blit_A.mmx-speed.patch.txt -- Speed improvements and a bugfix for the current GCC inline mmx asm code: - Changed some ops and removed some resulting useless ones. - Added some instruction parallelism (some gain) The resulting speed on my Xeon improved upto 35% depending on the function (measured in fps). - Fixed a bug where BlitRGBtoRGBSurfaceAlphaMMX() was setting the alpha component on the destination surfaces (to opaque-alpha) even when the surface had none. SDL_blit_A.mmx-msvc.patch.txt -- MSVC mmx intrinsics version of the same GCC asm code. MSVC compiler tries to parallelize the code and to avoid register stalls, but does not always do a very good job. Per-surface blending MSVC functions run quite a bit faster than their pure-asm counterparts (upto 55% faster for 16bit ones), but the per-pixel blending runs somewhat slower than asm. - BlitRGBtoRGBSurfaceAlphaMMX and BlitRGBtoRGBPixelAlphaMMX (and all variants) can now also handle formats other than (A)RGB8888. Formats like RGBA8888 and some quite exotic ones are allowed -- like RAGB8888, or actually anything having channels aligned on 8bit boundary and full 8bit alpha (for per-pixel alpha blending). The performance cost of this change is virtually 0 for per-surface alpha blending (no extra ops inside the loop) and a single non-MMX op inside the loop for per-pixel blending. In testing, the per-pixel alpha blending takes a ~2% performance hit, but it still runs much faster than the current code in CVS. If necessary, a separate function with this functionality can be made. This code requires Processor Pack for VC6.
author Sam Lantinga <slouken@libsdl.org>
date Wed, 15 Mar 2006 15:39:29 +0000
parents d910939febfa
children 782fd950bd46 c121d94672cb a1b03ba2fcd0
line wrap: on
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/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2004 Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public
    License along with this library; if not, write to the Free
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    Sam Lantinga
    slouken@libsdl.org
*/
#include "SDL_config.h"

/*
	Blowup extension definitions

	Patrice Mandin
*/

#ifndef _SDL_xbios_blowup_h
#define _SDL_xbios_blowup_h

#include "SDL_xbios.h"

/*--- Types ---*/

typedef struct {
	/* 64 bytes */
	unsigned short	enabled;		/* Extended mode enabled ? 0=yes, <>0=no */
	unsigned short	dummy10[6];
	unsigned short	registers_0E;	/* value for register 0xffff820e */
	unsigned short	registers_10;	/* value for register 0xffff8210 */
	unsigned short	dummy11[23];

	/* 64 bytes */
	unsigned short	width;			/* width-1 */
	unsigned short	height;			/* height-1 */
	unsigned short	dummy20;
	unsigned long	screensize;		/* screensize in bytes */
	unsigned short	dummy21[8];
	unsigned short	virtual;		/* Virtual screen ? */
	unsigned short	virwidth;		/* Virtual screen width */
	unsigned short	virheight;		/* Virtual screen height */

	unsigned short dummy22;
	unsigned short monitor;			/* Monitor defined for this mode */
	unsigned short extension;		/* Extended mode defined ? 0=yes, 1=no */
	unsigned short dummy23[13];

	/* 64 bytes */
	unsigned short	dummy30;
	unsigned short	registers_82[6];	/* values for registers 0xffff8282-8c */
	unsigned short	dummy31[9];

	unsigned short	dummy32;
	unsigned short	registers_A2[6];	/* values for registers 0xffff82a2-ac */
	unsigned short	dummy33[9];

	/* 64 bytes */
	unsigned short	registers_C0;	/* value for register 0xffff82c0 */
	unsigned short	registers_C2;	/* value for register 0xffff82c2 */
	unsigned short	dummy40[30];
} __attribute__((packed)) blow_mode_t;

typedef struct {
	blow_mode_t	blowup_modes[10];
	unsigned char	num_mode[6];
	unsigned long	dummy;
	unsigned short	montype;
} __attribute__((packed)) blow_cookie_t;

/*--- Functions prototypes ---*/

void SDL_XBIOS_BlowupInit(_THIS, blow_cookie_t *cookie_blow);

#endif /* _SDL_xbios_blowup_h */